CVE-2026-34758

Name: CVE-2026-34758
Creator: NVD / NIST
Published: 2026-04-02T19:21:33.67+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2026-34758 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, unauthenticated access to Notification test and Phone Number management endpoints allows SMS/Call/Email/WhatsApp abuse and phone number purchase. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, unauthenticated access to Notification test and Phone Number management endpoints allows SMS/Call/Email/WhatsApp abuse and phone number purchase. This issue has been patched in version 10.0.42.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.35%

26.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Hackerbay	Oneuptime	< 10.0.40

References

https://github.com/OneUptime/oneuptime/commit/9adbd04538714740506708d6fa610e433be4d2a4Patch
https://github.com/OneUptime/oneuptime/releases/tag/10.0.42Release Notes
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-q253-6wcm-h8hpExploit, Mitigation, Vendor Advisory
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-q253-6wcm-h8hpExploit, Mitigation, Vendor Advisory

Timeline

Published: Apr 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34758?

How severe is CVE-2026-34758?

CVE-2026-34758 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34758?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34758?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST